The film, featuring the voices of Kelly Macdonald, Billy Connolly and Robbie Coltrane, is released on August 17 in the UK.

There are hundreds of so-called 'easter eggs' to be found in Pixar's back catalogue, cross referencing the studio's films.

One frequently used is the code 'A113', a reference to a room at California Institute of the Arts where directors John Lasseter and Brad Bird went to college, with variations of it in many of the Pixar films.

Characters from other films also often appear fleetingly in many of the studio's finished projects.